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Issue 16, 2017
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A dimeric fullerene derivative for efficient inverted planar perovskite solar cells with improved stability

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Abstract

Fullerene derivatives can efficiently passivate the interfacial defects of perovskite layers to improve the performance of perovskite solar cells. In this work, a new dimeric fullerene derivative (D-C60) with two [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) units was designed, synthesized and applied as the electron transporting material (ETM) in perovskite solar cells (PSCs) taking advantage of its appropriate energy levels, relatively fast electron mobility, and easy solution processability compared to the widely used PC61BM, D-C60 can efficiently passivate the trap states between the perovskite and fullerene layers, leading to improved electron extraction and overall photovoltaic performance. Devices based on D-C60 as the ETM achieved power conversion efficiencies (PCEs) of 16.6%, which is significantly higher than that observed with PC61BM (14.7%). In addition, the more hydrophobic and compact D-C60 layer resulted in higher device stability than that with PC61BM. These results show that covalently linked dimeric fullerene derivative can act as efficient electron transporting materials (ETMs) for high performance PSCs.

Graphical abstract: A dimeric fullerene derivative for efficient inverted planar perovskite solar cells with improved stability

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Publication details

The article was received on 11 Jan 2017, accepted on 22 Feb 2017 and first published on 23 Feb 2017


Article type: Paper
DOI: 10.1039/C7TA00362E
Citation: J. Mater. Chem. A, 2017,5, 7326-7332
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    A dimeric fullerene derivative for efficient inverted planar perovskite solar cells with improved stability

    C. Tian, K. Kochiss, E. Castro, G. Betancourt-Solis, H. Han and L. Echegoyen, J. Mater. Chem. A, 2017, 5, 7326
    DOI: 10.1039/C7TA00362E

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